Personalization Key Limitations

Personalization keys should not exceed 512 bytes.

If total length of personalization keys in a package exceeds 512 bytes, the warning
The total length of personalization keys in the 
package exceeds maximum safe length limit of 512 bytes
displays in the Eclipse Problems view, and the project and deployment package contains a warning icon.
If the length of a specific personalization key's default value exceeds 512 bytes, the warning
The length of personalization key 'PersonalizationkeyName' 
exceeds maximum safe length limit of 512 bytes
displays in the Eclipse Problems View and Personalization key Properties page.