[Using Sakai] How to set the maximum upload limit for a particular site?

[Eric DUQUENOY]

Hi,
there a property in sakai.properties :
  content.upload.max = 40
it's set the The maximum size (in megabytes) allowed for a single file 
uploaded using a multipart form.

But, it's for all the sakai websites. How to set this limit for only one 
website?

Thanks
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  Eric Duquenoy - ULCO
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