You might try Calibre software.
http://calibre.kovidgoyal.net/
This is a third party eBook library software, that does format conversion. It does support conversion to/from the PDB format. And does do formats that are compatible with the Sony. And it is free. And according to some people, it is better than the Sony library software.
Quote:
calibre supports the conversion of many input formats to many output formats. It can convert every input format in the following list, to every output format.
Input Formats: CBZ, CBR, CBC, EPUB, FB2, HTML, LIT, LRF, MOBI, ODT, PDF, PRC**, PDB, PML, RB, RTF, TCR, TXT Output Formats: EPUB, FB2, OEB, LIT, LRF, MOBI, PDB, PML, RB, PDF, TCR, TXT
** PRC is a generic format, calibre supports PRC files with TextRead and MOBIBook headers
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According to Sony, supported formats include:
Quote:
The Reader supports the following file formats:
Unsecured Text: BBeB Book, Adobe® PDF, Adobe Digital Editions 1.5 or later, TXT, RTF, EPUB, Microsoft® Word (Conversion to the Reader-requires Word to be installed on your PC)
DRM Text: Adobe DRM-protected content, BBeB Book (Marlin) - Purchased through the eBook Store from Sony
NOTE: Adobe Digital Editions 1.5 or later and Adobe DRM-protected content requires the installation of the most current version of the eBook Library software which is available through the software and drivers link on this page.
Unsecured Audio: MP3 and AAC7
Image: JPEG, GIF, PNG, and BMP
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BUT
Quote:
Only model PRS-500 does not support the EPUB format. All current and recently announced models support the format.
We will be providing an update path for owners of the PRS-500 upon conversion of the store content. To be automatically notified when the update solution is available, send an email to feedback@ebookstore.sony.com with PRS500 Update in the subject line.
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So it looks like it will convert from PDB to EPUB, and that would be usable on all SOny Readers except the PRS-500.