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LRF stands for BroadBand eBook file, a format used primarily for eBooks designed for Sony Reader devices. It contains text and images formatted in a way that optimizes reading on small screens. The LRF format was among the early eBook standards before more widely adopted formats like EPUB became popular. Its use has declined as newer, more versatile formats have taken over the digital reading market.
Technically, LRF files are based on XML and utilize the BBeB (BroadBand eBook) standard, which compresses text and image data to reduce file size. The format encapsulates content and formatting information, ensuring consistent display across compatible devices. LRF files typically use the .lrf extension and can be converted to other formats like EPUB or PDF with specialized software. The format's architecture influenced later eBook formats by emphasizing portability and readability.
LRF files were developed by Sony as part of their efforts to establish a proprietary eBook ecosystem. These files support features like bookmarking, annotations, and text resizing, which improved the digital reading experience at the time. Despite its limited current usage, LRF played a significant role in popularizing digital books. Many modern eBook readers and apps no longer support LRF natively, favoring open standards instead.
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