Sentry's Terms of Use state:

​Publicity. Neither party may publicly announce this Agreement except with the other party’s prior consent or as required by Laws. However, Sentry may include Customer and its trademarks in Sentry’s customer lists and promotional materials, issue a press release identifying Customer as a Sentry customer, inform other potential customers that Customer is a Sentry customer and identify Customer as a customer in other forms of publicity (including, without limitation, case studies and blog posts), but will cease such use at Customer’s written request.
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If you do not wish to allow Sentry to use your logo, or trademark, in customer lists or promotional materials please contact [email protected] with a formal written request to revoke this consent.