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<p class=MsoNormal><span lang=EN-US>How to write a good handing application for
a DRM file wrapper format? <o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>This DRM format can protect any
MIME type of content. <o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>It adds an encryption wrapper
layer outside of the original content. <o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>From the DRM file header, we can
find the MIME type of the protect content<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I had written a handling application for
the DRM MIME type (wrapper MIME type). This application can get the MIME type
of the protected content (embedded MIME type), and try to launch the handling
application for the embedded MIME types. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>But I met a problem:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>There are two types of applications that
can handle a same embedded MIME type, and I cannot which is the default one to
be launched:<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>Type A can handle the DRM MIME
type, it can handle both the decryption and the protected content. But It
cannot handle all kinds of embedded MIME type, only certain types.<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l0 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>Type B cannot handle DRM.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I hope A can be launched but B may be the
default one for the embedded MIME type.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>So is there a better way to handle such a
wrapper + embedded MIME case? Is it double to mix the wrapper type and
embedded type into a new MIME type, and let type A application handle such new type?
<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Great thanks!<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Amanda<o:p></o:p></span></p>
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