Documentation

    Table of Content
    • 3D File Formats
      • 3D File Formats
      • 3D2
      • 3DS
      • 3MF
      • AMF
      • ASE
      • DAE
      • DRC
      • E57
      • FBX
      • GLB
      • GLTF
      • IPT
      • JRXML
      • JT
      • MA
      • MB
      • OBJ
      • PLY
      • PRC
      • RVM
      • STEP
      • U3D
      • USD
      • USDZ
      • VRML
      • X
      • X3D
    • Audio File Formats
      • Audio File Formats
      • AAC
      • AC3
      • ALAC
      • FLAC
      • M3U
      • MID
      • MKA
      • MP3
      • MPC
      • OGG
      • OPUS
      • RA
      • SDT
      • STAP
      • WAV
      • WMA
    • CAD File Formats
      • CAD File Formats
      • CF2
      • DC3
      • DGN
      • DWF
      • DWFX
      • DWG
      • DWT
      • DXF
      • HPGL
      • IFC
      • IGES
      • IGS
      • JVSG
      • NWC
      • NWD
      • NWF
      • PAT
      • PHJ
      • PLT
      • PSM
      • PSS
      • RVT
      • STL
    • Compression File Formats
      • Compression File Formats
      • 7Z
      • ARC
      • ARJ
      • B6Z
      • BZ2
      • DAA
      • DAR
      • DEB
      • GZ
      • ICE
      • KGB
      • LBR
      • LZ4
      • LZMA
      • MPKG
      • OAR
      • PKG
      • RAR
      • RPM
      • RTE
      • TAR
      • TBZ
      • TGS
      • XAPK
      • XAR
      • ZIM
      • ZIP
      • ZL
    • Database
      • Database File Formats
      • ACCDB
      • ACCDE
      • ACCDT
      • ACCFT
      • BAK
      • BCP
      • DDL
      • DTSX
      • LDF
      • MDB
      • MDF
      • MYI
      • NDF
      • NSF
      • SQL
      • SQLITE
    • EBook File Formats
      • EBook File Formats
      • ACSM
      • AEP
      • APNX
      • AVA
      • AZW
      • AZW1
      • AZW3
      • AZW4
      • BKK
      • BPNUEB
      • CBC
      • CBR
      • CBZ
      • CEB
      • CEBX
      • DNL
      • EA
      • EAL
      • EBK
      • EDN
      • EPUB
      • ETD
      • FB2
      • FKB
      • HAN
      • HTML0
      • HTMLZ
      • HTXT
      • HTZ4
      • HTZ5
      • IBOOKS
      • KFX
      • KOOB
      • LIT
      • LRF
      • LRS
      • LRX
      • MART
      • MBP
      • MOBI
      • NCX
      • NVA
      • OEB
      • OEBZIP
      • OPF
      • ORB
      • PDB
      • PHL
      • PML
      • PMLZ
      • POBI
      • QMK
      • RB
      • RZB
      • RZS
      • SNB
      • TCR
      • TK3
      • TPZ
      • TR
      • TR3
      • VBK
      • WEBZ
      • YBK
    • Email File Formats
      • Email File Formats
      • EDB
      • EML
      • EMLX
      • ICS
      • MBOX
      • MSG
      • OFT
      • OLM
      • OST
      • PST
      • TNEF
      • VCF - Virtual Contact File
    • Font
      • Font File Formats
      • CFF
      • CFF2
      • EOT
      • FNT
      • FON
      • JFPROJ
      • OTF
      • PFA
      • PFB
      • PFM
      • SFD
      • TTC
      • TTF
      • Type1
      • WOFF
    • GIS File Formats
      • GIS File Formats
      • 000
      • E00
      • FileGDB
      • GeoJSON
      • GML
      • GPX
      • KML
      • KMZ
      • OSM
      • QGD
      • QGS
      • QGZ
      • QLR
      • QML
      • SHP
    • Image File Formats
      • Image File Formats
      • AI
      • APNG
      • AVIF
      • BMP
      • BPG
      • CDR
      • CMX
      • CPC
      • DCM
      • DIB
      • DICOM
      • DJVU
      • DNG
      • EMF
      • EMZ
      • EXIF
      • FLIF
      • FODG
      • GBR
      • GIF
      • HEIC
      • HEIF
      • ICO
      • J2C
      • J2K
      • JFIF
      • JP2
      • JPEG
      • JPF
      • JPM
      • JPX
      • JXR
      • MNG
      • ODG
      • OTG
      • PNG
      • PSB
      • PSD
      • SVGZ
      • TGA
      • TIFF
      • VDX
      • VSD
      • VSDM
      • VSDX
      • VSS
      • VSSM
      • VSSX
      • VST
      • VSTM
      • VSTX
      • VSX
      • VTX
      • WEBP
      • WMF
      • WMZ
      • XPM
    • Note Taking File Formats
      • Note Taking File Formats
      • ONE
      • ONETOC2
    • Page Description Language
      • Page Description Language
      • CGM
      • EPS
      • OXPS
      • PCL
      • PS
      • SVG
      • SWF
      • TEX
      • XPS
      • XSLFO
    • PDF
      • PDF
      • PDF/A
      • PDF/E
      • PDF/UA
      • PDF/VT
      • PDF/X
    • Presentation File Formats
      • Presentation File Formats
      • ODP
      • OTP
      • POT
      • POTM
      • POTX
      • PPS
      • PPSM
      • PPSX
      • PPT
      • PPTM
      • PPTX
    • Programming
      • Programming
      • C
      • Class
      • CPP
      • CS
      • CSPROJ
      • Dart
      • H
      • JAR
      • Java
      • JSP
      • JSPF
      • KT
      • MEL
      • MF
      • PHP
      • PY
      • SH
      • SLN
      • SWIFT
      • TOML
      • VB
      • VBPROJ
      • VCXPROJ
      • YAML
    • Project Management File Formats
      • Project Management File Formats
      • MPP
      • MPT
      • MPX
      • XER
      • XML
    • Spreadsheet File Formats
      • Spreadsheet File Formats
      • CSV
      • DIF
      • FODS
      • NUMBERS
      • NUMBERS-TEF
      • ODS
      • OTS
      • SXC
      • TSV
      • XLA
      • XLAM
      • XLM
      • XLS
      • XLSB
      • XLSM
      • XLSX
      • XLT
      • XLTM
      • XLTX
    • Video File Formats
      • Video File Formats
      • 3G2
      • 3GP
      • AMV
      • ASF
      • AVCHD
      • AVI
      • F4V
      • FLV
      • H264
      • H265
      • M4V
      • MJPEG
      • MK3D
      • MKS
      • MKV
      • MOV
      • MP4
      • MPG
      • MXF
      • QT
      • RM
      • RMVB
      • RV
      • SRT
      • VOB
      • VP6
      • VP8
      • VP9
      • WEBM
      • WMV
      • Xvid
    • Web File Formats
      • Web File Formats
      • ASP
      • ASPX
      • CHM
      • CSS
      • HTM
      • HTML
      • IXBRL
      • JS
      • JSON
      • MHT
      • MHTML
      • Sass
      • SCSS
      • VDW
      • XAML
      • XBRL
      • XHTML
      • XOML
      • XSLT
    • Word Processing File Formats
      • Word Processing File Formats
      • ABA
      • DOC
      • DOCM
      • DOCX
      • DOT
      • DOTM
      • DOTX
      • MD
      • ODT
      • OTT
      • RTF
      • TXT
      • WPS
    • Reporting
      • RDL
      • RDLC
      • RPL
    1. Home
    2. EBook File Formats
    3. LRF

    What's on this Page

      • What is a LRF file?
      • Brief History
      • LRF File Format
        • LRF header
      • References

    What is a LRF file?

    A file with .lrf extension is a Broad Band eBook (BBeB)file that contains data for a Sony BBeB, including text, images and pagination data. The file is saved in a compressed binary format which contains a header, a specified number of objects, and an object index. LRF and LRX files enclose the two BBeB book formats available. The LRF files are not encrypted and can be compiled from LRX files. The LRF files can be converted from several other file types including .PDF and .HTML. If your computer cannot open the LRF file, then you probably do not have the software installed to open or edit the LRF files. Programs that can open LRF files are Caliber, BookDesigner, Makelrf and Canon Book Creator for Windows, Caliber for Linux, Caliber and Sony Reader for Macintosh.

    Brief History

    LRF file type is first and foremost associated with Line Rider by inXile entertainment. The Line Rider is an internet physics toy and was invented on September 2006 by a Slovenian university student, Boštjan Čadež. Sony brand eBook eReaders (such as Sony PRS-500 readers and Sony Librie) utilize the LRF file extension for their documents and texts. This proprietary file type is now obsolete, as well as the related LRS and LRX files. Those three file types made up the BroadBand eBook (BBeB) which was discontinued in 2010 when Sony began selling their ebooks in the EPUB format.

    LRF File Format

    Detailed specifications of LRF file format are available at web archive. A LRF file consists of:

    • a header
    • a number of objects
    • an object index.

    All these values are in Intel (LSB first) order.

    LRF header

    Offset (hex)Size(bytes)Name/meaningExample value
    08LRF Signature4C 00 52 00 46 00 00 00 = “LRF” in Unicode
    82version?999 in most files
    A2“Psuedo-Encryption”key byte 48
    0C4RootObjectID0x0044
    108NumberOfObjects342
    188ObjectIndexOffset0x00093440
    204unknown0
    241Flags(16 - back to front, 1 = front to back) 16
    251unknown(padding?) 0
    262unknown1600
    282unknown(padding?) 0
    2A2Height?600
    2C2Width?800
    2E1unknown24
    2F1unknown(padding?) 0
    300x14unknownzeroes
    444Object ID of only PlaneStream (0x1E) object0x0042
    484unknown0x1536
    4C2XMLCompSize0x035C

    References

    • LRF File Format
    • BBeB - By Wikipedia

    See Also

    • LRS - Librie Reader Source File Format
    • LRX - Librie Reader Source File Format
    • What is an EPUB file?
    • AVIF File Format
    • RA File Format