In reply to sabina And, because the Digicel contract covers all home and away tours (even those outside the FTP), the WICB cannot search for an outside sponsor and must fulfill its obligations, which includes Digicel branding on the players' clothing."
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Thats actually incorrect. The WICB can get a sponsor, but they have to convince Digicel to agree to share sponsorship
( This particular misstatement is constant on this MB),
Generally, Digicel will go along with a cosponsorship, so long as the cosponsor isnt a competitor.
See PEPSI as sponsor for the Indian ODIS:
This, however, does not mean that Pepsi will be the sole title sponsors of the two series, against West Indies and Sri Lanka. They can sell it to other companies like they have done in the past though at the moment it is unclear whether a similar arrangement will be reached for these one-dayers as well. Last year the home series were alternately titled the Videocon Cup and the TVS Cup.
http://content-usa.cricinfo.com/india/content/story/276014.html