Pdf file has a virus attacked in 2001 and its name was "outllookpdf.worm. Then it make a solution for virus attack. On 30th march 2010, security researcher Dider Steven reported an "exploid" that cause an arbitrary executable file to be run when a PDF file is opened after user accepts a warning prompt. Even a user can convert the pdf to word if he/she will find PDF virus attack.
Accessibility:-
PDF file format has three views:-
1. Physical view
2. Tagged view
3. Content view
The physical view is displayed and printed (what most people consider a PDF document). The tags view is what screen readers read (useful for people with poor eyesight). The content view is displayed when the document is re-flowed to Acrobat (useful for people with mobility disability). For a PDF document to be accessible, the three views must be consistent with each other.
User Restrictions:-
User can encrypt the PDF so that password is needed to view or edit the content. PDF also contain DRM restrictions so that further printing, editing and coping limit controls can be handled.
Accessibility:-
PDF file format has three views:-
1. Physical view
2. Tagged view
3. Content view
The physical view is displayed and printed (what most people consider a PDF document). The tags view is what screen readers read (useful for people with poor eyesight). The content view is displayed when the document is re-flowed to Acrobat (useful for people with mobility disability). For a PDF document to be accessible, the three views must be consistent with each other.
User Restrictions:-
User can encrypt the PDF so that password is needed to view or edit the content. PDF also contain DRM restrictions so that further printing, editing and coping limit controls can be handled.
