Customers unable to open pdfs

i have been sending pdf files years , customers can not open them. when try message;

this xml file not appear have style information associated it. document tree shown below.

 

<error>

 

 

<code>accessdenied</code>

 

<message>access denied</message>

<requestid>524b1ad1c0f52f60</requestid>

 

<hostid>

 

jld2gkq8ycj7kbi9arbkvyqllfvdozb3cw0rtnyprcwn8fglb+x4frgvwkgjw6tc

</hostid>

</error>

 

what has changed?

sending how?  recipients open them how?

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