Unlock anti theft

To help you guide, how to unlock the tablet when you have forgotten the password. Please find the link given below and follow the step-by-step instructions mentioned on it:
https://us.en.kb.sony.com/app/answers/detail/a_id/34545/~/i-have-forgotten-the-pattern,-pin-or-password-needed-to-unlock-the-tablet.

GuruAid.com

Continue trying passwords until the tablet asks for your google account sign in. For the user name type the word null, for the password type four zeros, ie, 0000. This is the universal google unlock code for android devices.

To my knowledge, you would need to do a factory reset if you have forgot your password. That was my only option. I hope you backed it up or you will need to reload all your apps and such things.

If you can't get in your tablet because you forgot your password, the only way in, is to reset the tablet and setting up the tablet from scratch. You will lose all data, like contact lists, notes, images, and all apps, you did not backup on a computer or in the cloud.
Setting up a password protection on a tablet, was to prevent anyone without password to be able to access your data. Now you forgot the password, you are excluded to the information too.
If there was a general code to unlock every password, that would make the security a farce and worth nothing.

If it's an android device...
1. Enter wrong pattern 5 times and wait for 30 seconds.
2. Select "Forgot pattern" and enter your email account username and password.
3. Make sure you use the same account that was used to activate the device and double check the password by logging in to that email account in a browser.
4. If you don't have access to the original email account, you will need to do a hard reset and loose your settings and apps on the devcice. The data on the memory card will not be wiped though.
Note: if you can't remember your email password, you will have to visit the email service support page to get it reset.
also, see here...
http://www.androidtablets.net/forum/android-tablet-usage-tips-tricks/6280-forgot-your-unlock-pattern.html
or here... http://mytabletguru.com/forgot-password-pattern-unlock-of-android-tablet/

1. Enter wrong pattern 5 times and wait for 30 seconds.
2. Select "Forgot pattern" and enter your email account username and password.
3. Make sure you use the same account that was used to activate the device and double check the password by logging in to that email account in a browser.
4. If you don't have access to the original email account, you will need to do a hard reset and loose your settings and apps on the devcice. The data on the memory card will not be wiped though.
Note: if you can't remember your email password, you will have to visit the email service support page to get it reset.
also, see here...
http://www.androidtablets.net/forum/android-tablet-usage-tips-tricks/6280-forgot-your-unlock-pattern.html
or here... http://mytabletguru.com/forgot-password-pattern-unlock-of-android-tablet/

you can reset your iTunes password from the iTunes web site, and the associated em address. and restore the iOS device on your computer with the iTunes app

http://www.dummies.com/how-to/content/how-to-remove-downloaded-apps-from-your-samsung-ga.html

I can lock up my Facebook, WhatsApp, Clash of Clans, Messenger, Gallery and other important apps which may leak your privacy with LEO Privacy. And I can also customize my lock mode which allows me to lock different apps under different circumstances. it is really an smart applock, you will never worry about forgetting password. LEO Privacy Applock Boost Hide Android Apps on Google Play

Ring 0800samsung and in still anti theft app in future will help