Z:gnu-www-ja-accessibility--e27dd1-Proprietary file formats that/en

Proprietary file formats that require proprietary reading programs are poison to both accessibility and to the freedoms that we as free software activists hope to establish. The biggest offender is Flash format; it usually requires proprietary software that doesn't cooperate with accessibility. Microsoft Silverlight is similar. PDF is also difficult; though there is free software to view it, it does not support free access technology software. Improving this is an important project.